Exploring interference between Pc c̅ resonances and background in the pion-induced reaction
Abstract
We present a phenomenological study of the near-threshold π- p → J/ψn reaction, focusing on the interference effects between the s−channel Pc c̅ resonances and non-resonance background. This reaction provides a complementary probe to photoproduction for investigating the nature of the hidden-charm pentaquark states. Using an effective Lagrangian approach, we construct scattering amplitudes for JP=1/2- and 3/2- Pcc̅ states under two spin-parity scenarios, with the background dominated by the t−channel ρ meson exchange. We find that the interference can produce peaks, dips, or complex line shapes depending on the relative phase, in contrast to the simple resonance peaks commonly reported in previous theoretical studies. The two spin-parity scenarios yield qualitatively similar patterns, indicating that our main conclusion is robust. Given the current scarcity of experimental data for the pion-induced channel, we emphasize the urgent need for future measurements at J-PARC to understand the dynamics of the J/ψN interaction near threshold and to search for the heavy pentaquark states.
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BibTeX
@misc{lu2026exploring,
title = {{Exploring interference between $P_c \bar c$ resonances and background in the pion-induced reaction}},
author = {Qi-Fang Lü and Xurong Chen and Yu-Bing Dong and Igor I. Strakovsky and Xiao-Yun Wang and Ju-Jun Xie},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.23300},
eprint = {2609.23300},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.23300},
}
RIS
TY - UNPB
TI - Exploring interference between P_c c̅ resonances and background in the pion-induced reaction
AU - Qi-Fang Lü
AU - Xurong Chen
AU - Yu-Bing Dong
AU - Igor I. Strakovsky
AU - Xiao-Yun Wang
AU - Ju-Jun Xie
PY - 2026
DA - 2026/09/24
PB - arXiv
DO - 10.48550/arxiv.2609.23300
UR - https://arxiv.org/abs/2609.23300
AB - We present a phenomenological study of the near-threshold π^- p → J/ψn reaction, focusing on the interference effects between the s−channel P_c c̅ resonances and non-resonance background. This reaction provides a complementary probe to photoproduction for investigating the nature of the hidden-charm pentaquark states. Using an effective Lagrangian approach, we construct scattering amplitudes for J^P=1/2^- and 3/2^- P_cc̅ states under two spin-parity scenarios, with the background dominated by the t−channel ρ meson exchange. We find that the interference can produce peaks, dips, or complex line shapes depending on the relative phase, in contrast to the simple resonance peaks commonly reported in previous theoretical studies. The two spin-parity scenarios yield qualitatively similar patterns, indicating that our main conclusion is robust. Given the current scarcity of experimental data for the pion-induced channel, we emphasize the urgent need for future measurements at J-PARC to understand the dynamics of the J/ψN interaction near threshold and to search for the heavy pentaquark states.
ER -